You'll need to use CDKey's Facebook voucher code for the extra discount - the widget is at the top of the store page.
"You rule the workplace with The Sims 4 Get to Work. Actively control your Sims while they’re on the job, and determine whether they're headed toward a big promotion or are becoming the workplace menace. Jump to the rescue and save countless lives as a Doctor, torment your neighbors with mischievous inventions as a Scientist, or investigate crime scenes and crack the big cases as a Detective. If you’d rather be your own boss, you can even create, customize, and manage your own retail businesses and become a Simoleonaire! You decide how your Sims get to work."
Or... EA flogged you a half-finished game, so it's time to buy all the missing bits at £20 a pop. Still, better than £30.